Educational and Laboratory Stand "Installation of Elements of Protective Grounding, Zeroing, Disconnection Devices" Didactic Equipment Teaching Workbench Electrical Training Equipment

1. Product Introduction
1.1 Product Description
Electrical equipment is not energized under normal circumstances, but metal casings, frames, etc. that may be energized under fault conditions are reliably electrically connected to the earth through grounding devices to provide a low-impedance discharge path for fault current, greatly reducing the voltage between the equipment casing and the ground, thereby preventing electric shock accidents when people touch the casing. At the same time, it prompts the protection device (circuit breaker, fuse) to quickly cut off the power supply.
The fault current does not pass through (or rarely passes through) the earth, but flows directly back to the neutral point of the power supply through the equipment casing → zero line (PE/PEN) → to form a metal short circuit. The huge short-circuit current causes the protection device to act instantly (quick break).
Integrated detection elements (thermal element-bimetallic strip for overload, electromagnetic element-trip for short circuit) and operating mechanism. After detecting the fault current, the mechanical disconnection mechanism is triggered to disconnect the contacts. It can be manually reset for multiple uses. In case of overload and short circuit, the thermal effect or electromagnetic effect generated by the fault current itself is used to drive the disconnection action. In case of leakage, the current difference (residual current) between the live wire and the neutral wire is detected by the "zero-sequence current transformer", and then the disconnection is triggered by the electronic circuit or electromagnetic mechanism.
1.2 Product Features
(1) The training device adopts an aluminum profile frame structure, and each unit is flexible to cooperate, easy to use, and not easy to damage.
(2) The experimental circuit and device configuration are complete and can be used in combination to complete the training content of various subjects.
(3) The training platform has a good safety protection system.
(4) The principle is clear, which is the basic guarantee of electrical safety; it is suitable for various systems; it can effectively reduce the contact voltage.
(5) The fault removal speed is fast and the safety is high (on the premise of meeting the loop impedance requirements).
(6) The function is complete (it can integrate overload and short-circuit protection, and some have leakage protection), easy operation (manual opening and closing), reusable, easy to achieve selective protection, and clear status indication.
2. Technical specifications
2.1 Technical parameters
Power supply parameters: three-phase five-wire AC380V
Working conditions: ambient temperature -10℃～+40℃ Relative humidity ＜85% (25℃)
2.2 Dimensions and weight
Dimensions: 1255mmX630mmX1490mm
Weight: ＜100kg

3. Product component names and function introduction
3.1 Product main part

4. Product teaching experiment list (see the experimental instructions for details)
(1) Power box partial power-on test
(2) Panel component function test
(3) Single-phase protective shutdown device test